Answer:
D. 8x² + 11x - 9
Explanation:
Given M and N defined as follows:
[tex]\begin{gathered} M=5x^2+7x-4 \\ N=-3x^2-4x+5 \end{gathered}[/tex]Then:
[tex]\begin{gathered} M-N=(5x^2+7x-4)-(-3x^2-4x+5) \\ =5x^2+7x-4+3x^2+4x-5 \\ =5x^2+3x^2+7x+4x-4-5 \\ =8x^2+11x-9 \end{gathered}[/tex]The correct choice is D.
